The primary pattern of the late Cenozoic to the present tectonic deformation of China is characterized by relative movements and interactions of tectonic blocks. Active tectonic blocks are geological units that have b...The primary pattern of the late Cenozoic to the present tectonic deformation of China is characterized by relative movements and interactions of tectonic blocks. Active tectonic blocks are geological units that have been separated from each other by active tectonic zones. Boundaries between blocks are the highest gradient of differential movement. Most of tectonic activity occurs on boundaries of the blocks. Earthquakes are results of abrupt releases of accumulated strain energy that reaches the threshold of strength of the earth's crust. Boundaries of tectonic blocks are the locations of most discontinuous deformation and highest gradient of stress accumulation, thus are the most likely places for strain energy accumulation and releases, and in turn, devastating earthquakes. Almost all earthquakes of magnitude greater than 8 and 80%-90% of earthquakes of magnitude over 7 occur along boundaries of active tectonic blocks. This fact indicates that differential movements and interactions of active tectonic blocks are the primary mechanism for the occurrences of devastating earthquakes.展开更多
目的分析中国(未包括香港、澳门特别行政区和台湾地区,下同)18~59岁人群乙型病毒性肝炎(乙肝)的流行病学特征和接种乙肝疫苗(Hepatitis B Vaccine,HepB)的现状,以及感染乙肝病毒(Hepatitis B Virus,HBV)的风险,探讨HepB的免疫策略。方...目的分析中国(未包括香港、澳门特别行政区和台湾地区,下同)18~59岁人群乙型病毒性肝炎(乙肝)的流行病学特征和接种乙肝疫苗(Hepatitis B Vaccine,HepB)的现状,以及感染乙肝病毒(Hepatitis B Virus,HBV)的风险,探讨HepB的免疫策略。方法采用描述流行病学方法,分析2007~2012年中国疾病监测信息管理系统报告的乙肝病例的年龄别发病情况,以及1979年、1992年和2006年全国乙肝血清流行病学调查数据库。结果中国18~59岁人群急性乙肝报告发病率居高不下,易感人群的HepB接种率较低,感染风险较高。结论中国在成功实施新生儿HepB接种和儿童HepB查漏补种后,应适时开展18~59岁重点人群的HepB接种,进一步降低HBV感染率。展开更多
玫红百合(Lilium amoenum Wilson ex Sealy)是起源于中国的珍稀百合。本试验以王百合和麝香百合为母本与玫红百合进行了种间杂交。以花柱内授粉和幼胚离体培养法得到了王百合×玫红百合杂种F_1和麝香百合×玫红百合杂种F_1。通...玫红百合(Lilium amoenum Wilson ex Sealy)是起源于中国的珍稀百合。本试验以王百合和麝香百合为母本与玫红百合进行了种间杂交。以花柱内授粉和幼胚离体培养法得到了王百合×玫红百合杂种F_1和麝香百合×玫红百合杂种F_1。通过染色体组型分析确认了杂种的真实性。杂种王百合×玫红百合杂种F_1花朵为粉红色、株矮,可供盆栽,花粉不育。麝香百合×玫红百合杂种F_1花色淡粉红,诱导成多倍体后花粉可育,可作为进一步杂交的亲本。展开更多
目的通过对流行性腮腺炎减毒活疫苗(Mumps Attenuated Live Vaccine,MuV)免疫学效果和保护效果的系统评价,为完善MuV免疫策略提供依据。方法采用系统评价方法,以疫苗、流行性腮腺炎、效果为检索词,全面检索中国知识资源总库期刊全文数据...目的通过对流行性腮腺炎减毒活疫苗(Mumps Attenuated Live Vaccine,MuV)免疫学效果和保护效果的系统评价,为完善MuV免疫策略提供依据。方法采用系统评价方法,以疫苗、流行性腮腺炎、效果为检索词,全面检索中国知识资源总库期刊全文数据库(1994~2011年)及其世纪期刊(1979~1993年)和万方学术期刊数据库(1982~2011年),对纳入文献进行系统分析。结果符合纳入标准的文献23篇,16篇涉及MuV免疫学效果研究,3篇为MuV免疫持久性的研究,4篇为病例对照研究。对MuV免疫学效果和保护效果系统评价显示:血凝抑制抗体阳转率为23.21%~93.18%,IgG抗体阳转率为83.2%~97.7%;3年后抗体阳性率保持>75%;Meta分析显示,疫苗的保护效果为85%。结论接种MuV后,IgG抗体阳转率较高,并能保持较好的持久性和保护作用。展开更多
文摘The primary pattern of the late Cenozoic to the present tectonic deformation of China is characterized by relative movements and interactions of tectonic blocks. Active tectonic blocks are geological units that have been separated from each other by active tectonic zones. Boundaries between blocks are the highest gradient of differential movement. Most of tectonic activity occurs on boundaries of the blocks. Earthquakes are results of abrupt releases of accumulated strain energy that reaches the threshold of strength of the earth's crust. Boundaries of tectonic blocks are the locations of most discontinuous deformation and highest gradient of stress accumulation, thus are the most likely places for strain energy accumulation and releases, and in turn, devastating earthquakes. Almost all earthquakes of magnitude greater than 8 and 80%-90% of earthquakes of magnitude over 7 occur along boundaries of active tectonic blocks. This fact indicates that differential movements and interactions of active tectonic blocks are the primary mechanism for the occurrences of devastating earthquakes.
文摘目的分析中国(未包括香港、澳门特别行政区和台湾地区,下同)18~59岁人群乙型病毒性肝炎(乙肝)的流行病学特征和接种乙肝疫苗(Hepatitis B Vaccine,HepB)的现状,以及感染乙肝病毒(Hepatitis B Virus,HBV)的风险,探讨HepB的免疫策略。方法采用描述流行病学方法,分析2007~2012年中国疾病监测信息管理系统报告的乙肝病例的年龄别发病情况,以及1979年、1992年和2006年全国乙肝血清流行病学调查数据库。结果中国18~59岁人群急性乙肝报告发病率居高不下,易感人群的HepB接种率较低,感染风险较高。结论中国在成功实施新生儿HepB接种和儿童HepB查漏补种后,应适时开展18~59岁重点人群的HepB接种,进一步降低HBV感染率。
文摘玫红百合(Lilium amoenum Wilson ex Sealy)是起源于中国的珍稀百合。本试验以王百合和麝香百合为母本与玫红百合进行了种间杂交。以花柱内授粉和幼胚离体培养法得到了王百合×玫红百合杂种F_1和麝香百合×玫红百合杂种F_1。通过染色体组型分析确认了杂种的真实性。杂种王百合×玫红百合杂种F_1花朵为粉红色、株矮,可供盆栽,花粉不育。麝香百合×玫红百合杂种F_1花色淡粉红,诱导成多倍体后花粉可育,可作为进一步杂交的亲本。
文摘目的通过对流行性腮腺炎减毒活疫苗(Mumps Attenuated Live Vaccine,MuV)免疫学效果和保护效果的系统评价,为完善MuV免疫策略提供依据。方法采用系统评价方法,以疫苗、流行性腮腺炎、效果为检索词,全面检索中国知识资源总库期刊全文数据库(1994~2011年)及其世纪期刊(1979~1993年)和万方学术期刊数据库(1982~2011年),对纳入文献进行系统分析。结果符合纳入标准的文献23篇,16篇涉及MuV免疫学效果研究,3篇为MuV免疫持久性的研究,4篇为病例对照研究。对MuV免疫学效果和保护效果系统评价显示:血凝抑制抗体阳转率为23.21%~93.18%,IgG抗体阳转率为83.2%~97.7%;3年后抗体阳性率保持>75%;Meta分析显示,疫苗的保护效果为85%。结论接种MuV后,IgG抗体阳转率较高,并能保持较好的持久性和保护作用。